1974-1988 Jeep J20 5.9L V8. 1974, 1976 Jeep J20 4.2L 6 Cyl. 1974-1978 Jeep J20 6.6L V8. Notes: Fail-Safe -- The patented Fail-Safe (R) thermostat is the only thermostat on the market designed to lock in the open position, allowing coolant to continue to flow in the event of overheating.; 195 Degrees F; OE Specified Temperature.
